Wiring system for ophthalmological apparatus



G- 5. DEY

WIRING SYSTEM FOR OPHTHALMOLOGICAL APPARATUS Filed August 21, 1924 INVENTOR.

ATTORNEYS Patented Oct. 26, 1926.

UNITED STATES 1,604,767 T NT our! GILBERT'S: DEY, OF MOUNT VERNON; NEW YORK, ASSIGNOR11O GENERAL. OPTICAL.

COMPANY,. ING.,. A CORPORATION? OF NEW YORK;.

WIRING SYSTEM FOR A OPHTHALMOLOGICAII ABP-ARATUS.

Application filed August 21, 1924. Serial No. 733,250.

My invention relates to ophthalmological units or apparatus which bring into one unitary, convenient-assembly all of the in struments and other paraphernalia used by oculists and optometrists in optical examination and treatment, and it relates more particularly to, the electrical wiring system for such apparatus.

Theprimary object of my invention is to provide such asystem which will be ofuniversal use witheither alternating or direct current and with any of the usual or standardoptical-instruments and apparatus without; danger of burningout an instrument. Other objects, such as economy in current consumption and convenience in operation and control, will appear from the following detailed description of one embodiment of myinvention.

Various voltages are required for various optical instruments, and the use of a current controller to adjust the voltage values to those suitable for the several instruments is accompanied by the danger of injuring an instrument through inadvertence. With my invention the voltage supplied to the connections for the various instruments is maintained, within the permissible, safe limits for all instruments of the particular class, and individual provision is made for all of the usual instruments in such a way that, while all dangeriseliminated, the voltage to each instrument may be varied as desired.

I' shall. now describe the illustrated embodiment of'my invention and shall thereafter point out my invention in claims.

The drawing is-a diagram ofone form of Wiring system embodying my invention.

Ihave shown my invention in a system as it would be adapted to the ophthalmological apparatus formingthe subject matter of the pending. application of Hans Clement and myself, Serial No. 67 3,728, filed November 9, 1923. That application shows a unitary support for variousinstruments which re quire full line voltage, such as anophth'al: mometer, a'refractor, and. a test cabinet, and alsojackstor receiving. various smaller 1nstruments that require low voltage, such as anophthalmoscope, a retinoscope and a transilluminator, as wellas binding posts and receptacles of selected voltages to which other apparatus and scopes may be connected.

In. accordance with my invention two the base andtheother socketbeing near' the bottom of the base. These sockets are connected by wires3and'4to a fuse block 5, which in turn" is connected to binding f posts 6 andTof a plate 8," which carries a switch 9, a pilot lamp10 andsa plug receptacle 11, alliconneot'ed in the line by suit able wiring, notindicated. The two other binding posts 12and 13'ionthe plate 8' are connectedby wires lt'and1'5 to the high voltage busses 16" and 17 It" is, therefore, evident thatthe. full line voltage is suppliedto the pilot lamp 10, to the receptaclell and to the busses 16 and 17, and in my system, these busses'are connected. to the ophthalmometer, to the sterilizer and: to the. test cabinet carried by the stand through wires 18, 19 andv20', respectively.

The busses 16 and. 17 are also connected to theprimaryof a transformer 21,.through. an alternative connection dependingupon whether the line current is alternating or direct. The busses 16 and17are connected by wires 22 and.23 to contacts 24. and 25. of a suitable two-way'swit'ch .9, while the primary of the transformer. is connected by wires 26"and27 to the contacts 28 and'29 of the switch. If the line current. is alternat ing the switch connects contacts 24Jand 25 with contacts28 and 29 directly, as shown bythe full lines, while if the line current is direct, the said contacts are connected through the contacts 24 and 25 of arotary converter 30.

The ratio of the illustrated'transformer issuch that the line voltage will be stepped" down to 15 voltsfon' a secondaryline connected to the two end turns on taps 31 and. 32. Between these two end taps are eleven intermediate tapshaving a potential vary ing from 2 volts to 14% volts. The terminals of the twelve taps from 2%. volts to 15 volts are arranged in an arc and a pivoted, switch member 33 is arranged to contact successively with all of; thetap terminals, as wellas with an additional contact 34: which isnot connected to the secondary ofthe transformer. and. hence has Zero voltage. In the. latter position, therefore, the switch member/is in. oif position...

The pivoted switch member 33 is, con,- nected by. wire 35,, switch 36 and.:wire 37 to leads of a retinoscope one binding post 38 of a cautery connection, the other binding post 39 of the cautery connection being attached by wire 40 to the lead 41 from the end tap 31 of the second ary of the transformer. It will, therefore, be seen that by adjusting the pivoted switch member 33, any one of the twelve selected voltages may be supplied to the cautery connection.

For the low voltage instruments a pair of low voltage busses 42 and 48 are pro vided. As shown, the voltage supplied to these busses is 2 volts, which is a safe and ,snfiicient voltage for the ordinary scopes used-for optical examination purposes. The bus 42 is connected to the end tap 31 by the wire 41, while the bus 43 is connected rheostat 45 to the 2 volt tap by wire 44, and wire 46. It will, therefore, be seen that while the maximum difierence in potential between the two busses 42 and 43 is 2 volts, this potential diiference may be reduced as desired by the manipulation of the rheostat 45.

As shown, three jacks 47, 48 and 49 are connected across the busses 42 and 48, the one terminal by conductors 50, 51 and 52, respectively, and the other terminal by the 53 and ophthalmoscope The construction of the said jacksis illustrated more particularly in the said pending application Serial No. 67 3,7 28, where 1t a appears that the jacks close as the instrubles within the cabinet.

ments are withdrawn and are automatically opened as the instruments are inserted in their sockets in the top of the cabinet, suitable retractors being provided for the ca- The voltage across the busses 42 and 43 may be indicated by a voltmeter 56.

In addition to the jacks 47, 48 and 49, my system also provides two binding posts 57 and 58 for special scopes requiring 2%; volts or less, the former binding post being con nected to the wire 46 and the latter binding post being connected to bus 42- through switch 59.

I I have also made provision, in accordance with my invention, for the connection of a tracer lamp 60 which requires higher voltage than the low voltage instruments. shown, I supply 6- volts to a bus 61 which is connected by wire 62 to the 6 volt tap from the secondary of the transformer. This tracer lamp also hasajack 63 which is automatically opened by'the insertion of the. tracer lamp handle. One terminal of the jack is connected by the conductor 64 to the bus 42, while the other terminal is connected to the bus 61 through the tracer lamp and its cables which are also supplied with suitable retractile means within the cabinet. 1 f

It is'obvious that various modifications in the details and arrangement of parts, herein described and illustrated for the purpose of explaining the nature of the invention, may be made by those skilled in the art within the principle and scope of the invention, as

movable switch member adapted to contact.

successively with the terminals of the several taps, an instrument connection having one terminal connected to theiswitch memher and the other terminal connected to one of the end taps, connections for the low voltage busses across two selected taps, and instrument leads connected across the low Voltage busses.

2. A wir'ng system for an ophthalmological apparatus comprising a source of line current, a pairof low voltage busses, a transformer having its primary connected to the source of line current, a plurality of spaced taps for the secondary of the transformer, a movable switch member adapted to contact successively with the terminals of the several taps, an instrument connection having one terminal connected to the switch member and the other terminal connected to one of the end taps, connections for the low voltage busses across two selected taps, an adjustable resistance in the connections of the low voltage busses, and instrument leads connected across the low voltage busses.

3'. A wiring system for an ophthalmological apparatus comprising a source of line current, a pair of low voltage busses, a transformer having its primary connected to the source of line current, a plurality of spaced taps for the secondary of the transformer, a movable switch member adaptedv to contact successively with the terminals of the several taps, an instrument connection having one terminal connected to the switch member and the other terminal connected to one of the end taps, connections for the low voltage busses across two selected taps, instrument leads connected across the low voltage busses, another bus connected to a selected tap, and instrument leads connected across said additional bus and one of the pair of low voltage busses.

4. A wiring system for an ophthalmological apparatus comprising a pair of high voltage busses adapted for connection to a source of line current, a pair of low yoltage busses, a transformer having its primary connected to the high voltage-busses, a plu rality of spaced taps for the secondary of the transformer, a movable switch-mem ber adapted to contact successively with the terminals of the several taps an instrument connection having one terminal connected tothe switch member and the other terminal connected to one of the end taps, connections for the low voltage busses across tWo selected taps, instrument leads connected across the low voltage busses and connections for an optical testing instrument to the high voltage busses.

5. A Wiring system for ophthalmological apparatus comprising a pair of high voltage busses adapted for connection to a source of line current, a pair of 10W voltage busses, a transformer, a rotary convertor, means for connecting the primary of the transformer to the high voltage busses selectively either directly or through the rotary convertor, a plurality of spaced taps for the secondary of the transformer, a movable switch member adapted to contact successively With the terminals of the several taps, an instrument connection having one terminal connected to the switch member and the other terminal connected to one of the end taps, connections for the low voltage busses across tWo selected taps and instrument leads connected across the low voltage busses.

In Witness whereof, I hereunto subscribe my signature.

GILBERT S. DEY. 

